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9.10
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1
George's main profession was a scientist and inventor.
False
True
2
Why did George Washington Carver share his discoveries with poor farmers?
To become famous
To make money
To improve their crop yields and quality of life
To win a prize
3
Electrons are subatomic particles with a negative charge that surround the nucleus of an atom.
True
False
4
What was one product George Washington Carver created using chemistry?
shoes
cars
apples
Shaving cream
5
If two liquids have different densities, what happens when you pour them together?
The less dense one sinks
They mix completely
The denser one sinks below the less dense one
They turn into a solid
6
Which of these is an example of a physical change, not a chemical change?
Mixing vinegar and baking soda to fizz
Cooking an egg until it’s hard
Cutting an apple into slices
Burning a marshmallow until it’s black
7
The Ethiopian proverb "A good name is better than a good perfume" relates to chemistry how?
Perfumes are temporary chemical mixtures, unlike a lasting
Perfumes are temporary chemical mixtures, unlike a lasting reputation
Perfumes are made of acids and bases
Perfumes are atoms
8
What is a compound that gives away protons called?
Acid
Base
Protons
Flour
9
Which of these shows a chemical change instead of a physical change?
Melting ice into water
Rusting a nail in the rain
Shredding paper into confetti
Freezing juice into popsicles
10
Molecules are the smallest particles of matter and contain protons, neutrons, and electrons.
True
False
11
The Periodic Table organizes elements based on their chemical properties and the number of neutrons they contain.
False
True
12
Chemistry is the study of how substances interact and how new substances can be created by combining existing ones.
True
False
13
Which crops did George Washington Carver chemically experiment with?
corn and maize
Peanuts, sweet potatoes, and soybeans
Corn, rice and oats
Orange, apples and grapes
14
What is the smallest particle of matter that contains neutrons, protons, and electrons?
Element
Molecule
Nucleus
Atom
15
Subatomic particles are larger than atoms and make up their structure.
False
True
16
Elements are distinguished from one another by the number of protons they contain.
True
False
17
Which subatomic particle carries no charge?
Electron
Neutron
Proton
